It has been a few hundred years since humans began to live on space colonies. In A.G. 101, an unknown enemy (UE) "GAFRAN" suddenly attacks one of the colonies "Angel". A long war against UE has begun.

In A.G 108, seven year old Flit Asuno lost his mother when UE attacked his colony "Ovan". His mother left him a memory unit "AGE" which had stored data of an ancient mobile suit Gundam. In A.G. 114, Flit completes the Gundam AGE and counterattacks against GAFRANs.